Eudemus was a student of Aristotle and an associate of Theophrastus. Following the death of Aristotle he went back to Rhodes and founded a school there. Though it seems his school did not survive his death, Rhodes nonetheless was the home of several philosophers in the Peripatetic tradition.

Like Theophrastus he wrote a history of astronomy. He also wrote a history of mathematics and treatises on arithmetic astrology, geometry and physics.

Around 320 BC, Eudemus wrote a formal history of Greek mathematics. No longer extant it was summarised in the fifth century CE by Proclus (411-485 BC). From this and other scattered sources it appears that Thales (624- 547 BC) was the first to start and prove certain elementary geometric theorems, although it is not known exactly what the concept of ‘proof’ may have meant to him.

**Eudemus of Rhodes (c.370 BC - c.300 BC)**